I was wondering, if the rx7's engine, electricle and interior parts can interchange. Obvously the 5-lug wheels and 4-lugs are different, but what about all the other parts? I probably have a chance to buy a working perfectly s4 gsl (or unless i am mistaken for gxl or somthing, it has 5-lugs) and also i can get a s4 se (the one with 4-lugs) that has no title but still works perfectly. so i might be able to get both cars for cheap, and is wondering if i can change parts whenever i need to.

 

They do share the same parts. Also, it would be a GXL, not GSL. You'll be able to easily swap parts as they're both S4 NA models.